Serviceable religious horror novel.
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This is the revised edition. I didn't detect any differences from the original 1990 version, but it's been a few years and I don't remember it all that well.

Reborn picks up a couple of decades after The Keep. Glaeken has finally been allowed to age normally when suddenly Rasalom re-enters the picture as the unborn baby of an innocent woman and her husband, the world's first clone. The Ally wants to destroy him and the Adversary has agents on-hand to protect him at all cost.

Wilson has fun here spinning out his Secret History of the World, and warping the religions of the world--particularly Catholicism--around it. Aside from that, it's pretty generic horror fare.